Automatic transmission synchronous gear shift
US8900095B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 2013 |
| Grant date | Dec 2, 2014 |
| Priority date | — |
| Expiry date | May 4, 2033 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2306/54
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A method of commanding a synchronous gear shift begins by receiving a request to shift from a third gear to a first gear, and skipping a second gear having a gear ratio between the gear ratio of the first gear and the gear ratio of the third gear. Subsequently the method includes: reducing a torque command to a predetermined value; opening a clutch disposed on the input shaft of the transmission to decouple the transmission from the engine; transitioning the engine from a torque-control mode into a speed-control mode; commanding the engine to rotate at a speed dictated by the motion of the vehicle and the gear ratio of the first gear; closing the clutch to couple the transmission and the engine; and transitioning the engine back into the torque-control mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.